ohh great, dont blame me if its rust lol okay lets try..
1. wind is when somthing is waved in the air like a big fan.
The wind element in the narutoverse is used by manipulating the air currents themselves or inhaling them to manipulate them in various other ways. Wind style is commonly known for its sharp and deadly ability to enhance or speed up weapons like we've seen Asuma do in the past.
2. i believe that fire is winds weakness because fire need air to grow, and wind is strong against lightning
Wind is weak to fire because fire requires oxygen to grow and thus, wind will only aid in creating a bigger stronger flame by adding more "fuel". Although that being said, that will not always apply. If a wind and fire technique collide from opposite directions, depending on their rank, they will cancel each other out and they will never fuel each other, instead the fire will continue forward at a weakened state.
-Fire and Wind creates a bigger, stronger fire.
**When a fire and a wind jutsu of the same rank are shot by two shinobi facing each other, the result won't be a stronger fire jutsu continuing forward, but instead it'll be a weakened fire jutsu (one rank lower then it originally was).
**When a fire jutsu clash with a one rank higher wind jutsu, they will both cancel each other out. If higher then one rank, the wind will overpower the fire. However, there are exceptions; for further details continue the reading.
3. Asuma and tamari and naruto are the only ones i can think of right off the bat.
Good
4. Chakra runs through your body like blood, and is gained through your physical and mental energy and also through training. You have several chakra points throughout your body(not sure how much).
Don't forget that chakra is the main "fuel" source for ninjutsu, elemental or not. Also in the narutoverse chakra can be seen as stamina. As we've seen with kakashi or naruto, when either ran out of chakra they were left very exhausted.
5.if you want to peform any type of ninjutsu, you need chakra. Ninjutsu is activated through handsigns like when peforming a fire ball jutsu.
Very short but you understand the basis of ninjutsu.
Sorry that its not detailed but its all i could think of right now..